{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-40009", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T07:20:57.151Z", "datePublished": "2025-10-20T15:26:55.208Z", "dateUpdated": "2026-05-11T21:40:42.885Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T21:40:42.885Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/proc/task_mmu: check p->vec_buf for NULL\n\nWhen the PAGEMAP_SCAN ioctl is invoked with vec_len = 0 reaches\npagemap_scan_backout_range(), kernel panics with null-ptr-deref:\n\n[ 44.936808] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN NOPTI\n[ 44.937797] KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\n[ 44.938391] CPU: 1 UID: 0 PID: 2480 Comm: reproducer Not tainted 6.17.0-rc6 #22 PREEMPT(none)\n[ 44.939062] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014\n[ 44.939935] RIP: 0010:pagemap_scan_thp_entry.isra.0+0x741/0xa80\n\n<snip registers, unreliable trace>\n\n[ 44.946828] Call Trace:\n[ 44.947030] <TASK>\n[ 44.949219] pagemap_scan_pmd_entry+0xec/0xfa0\n[ 44.952593] walk_pmd_range.isra.0+0x302/0x910\n[ 44.954069] walk_pud_range.isra.0+0x419/0x790\n[ 44.954427] walk_p4d_range+0x41e/0x620\n[ 44.954743] walk_pgd_range+0x31e/0x630\n[ 44.955057] __walk_page_range+0x160/0x670\n[ 44.956883] walk_page_range_mm+0x408/0x980\n[ 44.958677] walk_page_range+0x66/0x90\n[ 44.958984] do_pagemap_scan+0x28d/0x9c0\n[ 44.961833] do_pagemap_cmd+0x59/0x80\n[ 44.962484] __x64_sys_ioctl+0x18d/0x210\n[ 44.962804] do_syscall_64+0x5b/0x290\n[ 44.963111] entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nvec_len = 0 in pagemap_scan_init_bounce_buffer() means no buffers are\nallocated and p->vec_buf remains set to NULL.\n\nThis breaks an assumption made later in pagemap_scan_backout_range(), that\npage_region is always allocated for p->vec_buf_index.\n\nFix it by explicitly checking p->vec_buf for NULL before dereferencing.\n\nOther sites that might run into same deref-issue are already (directly or\ntransitively) protected by checking p->vec_buf.\n\nNote:\nFrom PAGEMAP_SCAN man page, it seems vec_len = 0 is valid when no output\nis requested and it's only the side effects caller is interested in,\nhence it passes check in pagemap_scan_get_args().\n\nThis issue was found by syzkaller."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/proc/task_mmu.c"], "versions": [{"version": "52526ca7fdb905a768a93f8faa418e9b988fc34b", "lessThan": "ca988dcdc6683ecd9de5f525ce469588a9141c21", "status": "affected", "versionType": "git"}, {"version": "52526ca7fdb905a768a93f8faa418e9b988fc34b", "lessThan": "a2cb8818a3d915cd33a1e8b2babc1bb0c34862c3", "status": "affected", "versionType": "git"}, {"version": "52526ca7fdb905a768a93f8faa418e9b988fc34b", "lessThan": "28aa29986dde79e8466bc87569141291053833f5", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/proc/task_mmu.c"], "versions": [{"version": "6.7", "status": "affected"}, {"version": "0", "lessThan": "6.7", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.50", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.16.10", "lessThanOrEqual": "6.16.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.17", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.12.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.16.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.17"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/ca988dcdc6683ecd9de5f525ce469588a9141c21"}, {"url": "https://git.kernel.org/stable/c/a2cb8818a3d915cd33a1e8b2babc1bb0c34862c3"}, {"url": "https://git.kernel.org/stable/c/28aa29986dde79e8466bc87569141291053833f5"}], "title": "fs/proc/task_mmu: check p->vec_buf for NULL", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/proc/task_mmu: check p->vec_buf for NULL\n\nWhen the PAGEMAP_SCAN ioctl is invoked with vec_len = 0 reaches\npagemap_scan_backout_range(), kernel panics with null-ptr-deref:\n\n[ 44.936808] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN NOPTI\n[ 44.937797] KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\n[ 44.938391] CPU: 1 UID: 0 PID: 2480 Comm: reproducer Not tainted 6.17.0-rc6 #22 PREEMPT(none)\n[ 44.939062] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014\n[ 44.939935] RIP: 0010:pagemap_scan_thp_entry.isra.0+0x741/0xa80\n\n<snip registers, unreliable trace>\n\n[ 44.946828] Call Trace:\n[ 44.947030] <TASK>\n[ 44.949219] pagemap_scan_pmd_entry+0xec/0xfa0\n[ 44.952593] walk_pmd_range.isra.0+0x302/0x910\n[ 44.954069] walk_pud_range.isra.0+0x419/0x790\n[ 44.954427] walk_p4d_range+0x41e/0x620\n[ 44.954743] walk_pgd_range+0x31e/0x630\n[ 44.955057] __walk_page_range+0x160/0x670\n[ 44.956883] walk_page_range_mm+0x408/0x980\n[ 44.958677] walk_page_range+0x66/0x90\n[ 44.958984] do_pagemap_scan+0x28d/0x9c0\n[ 44.961833] do_pagemap_cmd+0x59/0x80\n[ 44.962484] __x64_sys_ioctl+0x18d/0x210\n[ 44.962804] do_syscall_64+0x5b/0x290\n[ 44.963111] entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nvec_len = 0 in pagemap_scan_init_bounce_buffer() means no buffers are\nallocated and p->vec_buf remains set to NULL.\n\nThis breaks an assumption made later in pagemap_scan_backout_range(), that\npage_region is always allocated for p->vec_buf_index.\n\nFix it by explicitly checking p->vec_buf for NULL before dereferencing.\n\nOther sites that might run into same deref-issue are already (directly or\ntransitively) protected by checking p->vec_buf.\n\nNote:\nFrom PAGEMAP_SCAN man page, it seems vec_len = 0 is valid when no output\nis requested and it's only the side effects caller is interested in,\nhence it passes check in pagemap_scan_get_args().\n\nThis issue was found by syzkaller."}], "id": "CVE-2025-40009", "lastModified": "2026-04-15T00:35:42.020", "metrics": {}, "published": "2025-10-20T16:15:37.593", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/28aa29986dde79e8466bc87569141291053833f5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a2cb8818a3d915cd33a1e8b2babc1bb0c34862c3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ca988dcdc6683ecd9de5f525ce469588a9141c21"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Deferred"}

{"bugzilla": {"description": "kernel: fs/proc/task_mmu: check p->vec_buf for NULL", "id": "2405133", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2405133"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["No description is available for this CVE."], "name": "CVE-2025-40009", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-10-20T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-40009\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-40009\nhttps://lore.kernel.org/linux-cve-announce/2025102002-CVE-2025-40009-5a08@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-10-21T09:39:49.873868+00:00", "updated": "2025-10-21T09:39:49.873893+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}